splitrepo.sh

git clone <PRIVATE REPO>
cd sdk
git fetch --all
git pull --all
for branch in $(git branch --all | grep '^\s*remotes' | egrep --invert-match '(:?HEAD|master)$'); do
    git branch --track "${branch##*/}" "$branch"
done
git fetch --all
git pull --all
cd ..

cp -r sdk private-android
cd private-android
git remote rm origin
git clean -dfx
git reset --hard HEAD
git filter-branch -f --prune-empty --subdirectory-filter android -- --all
git for-each-ref --format="%(refname)" refs/original/ | xargs -n 1 git update-ref -d
git reflog expire --expire=now --all
git gc --prune=now